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This paper presents our study on a sparse antenna array for 0.22 THz imaging. Based on the effective aperture concept for the design of sparse antenna array, two schemes for high performance THz imaging of a target at distance of 1 m have been achieved in simulation. Then, different schemes of larger array element spacing and mechanical scanning spacing have been investigated to build the relationship...
This paper presents our studies on the scanning schemes deployed in a THz holographic imager. A fast angular beam scanning method is proposed and investigated, in comparison with the existed slow raster scanning method. The performance of both approaches are studied in simulation and partially evaluated in experiment.
The use of curved reflectarrays for telecommunication applications is presented in this paper. For contoured beam applications, the curvature of the reflectarray surface can be used to enhance the bandwidth significantly, yielding reflectarray designs that are equivalent in performance compared to traditional shaped reflector antennas. For multiple spot beam applications, the curvature of the reflectarray...
The number of main apertures needed to cover a full transmit/receive multiple spot beam mission can be reduced by using reflectarrays with array elements printed on a doubly curved surface. By combining the capabilities of the reflectarray and a parabolic surface, it is shown that three main apertures are sufficient for both transmit/receive operations if single-band array elements are used, whereas...
This paper describes a reflectarray concept that can produce a full dual-band (transmit/receive) multiple spot beam coverage in Ka-band using only two main apertures while maintaining single-feed-per-beam operation. The proposed concept combines the capabilities of the reflectarray and a parabolic surface, enabling the antenna to radiate more than one beam types in the typical “4-color” frequency...
The traditional complicated shells design of architecture applies mathematics lofting on the base of experience formula. The method is complicated, which result curve has no unambiguous implication. The traditional single aperture mesh modeling, which generally applies Delaunay triangulation, has difficulty in interaction control. A mixed subdivision modeling of single aperture mesh is represented...
An analysis technique for improved modeling of a printed reflectarray is proposed. The technique is based on a periodic approach where periodicity is applied on an extended unit cell, which includes the actual elements surrounding the element under consideration. An offset reflectarray sample has been manufactured and measured, and comparison of simulations and measurements is presented to verify...
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